EP0632203B1 - Electropneumatic converter with solenoid valve control - Google Patents

Electropneumatic converter with solenoid valve control Download PDF

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Publication number
EP0632203B1
EP0632203B1 EP94201712A EP94201712A EP0632203B1 EP 0632203 B1 EP0632203 B1 EP 0632203B1 EP 94201712 A EP94201712 A EP 94201712A EP 94201712 A EP94201712 A EP 94201712A EP 0632203 B1 EP0632203 B1 EP 0632203B1
Authority
EP
European Patent Office
Prior art keywords
pressure
chamber
solenoid valve
feed
capacitive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94201712A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0632203A1 (en
Inventor
Giorgio Bergamini
Venanzio Mininni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nuovo Pignone Holding SpA
Nuovo Pignone SpA
Original Assignee
Nuovopignone Industrie Meccaniche e Fonderia SpA
Nuovo Pignone SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nuovopignone Industrie Meccaniche e Fonderia SpA, Nuovo Pignone SpA filed Critical Nuovopignone Industrie Meccaniche e Fonderia SpA
Priority to SI9430011T priority Critical patent/SI0632203T1/xx
Publication of EP0632203A1 publication Critical patent/EP0632203A1/en
Application granted granted Critical
Publication of EP0632203B1 publication Critical patent/EP0632203B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
    • G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
    • G05D16/2046—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means the plurality of throttling means being arranged for the control of a single pressure from a plurality of converging pressures
    • G05D16/2053—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means the plurality of throttling means being arranged for the control of a single pressure from a plurality of converging pressures the plurality of throttling means comprising only a first throttling means acting on a higher pressure and a second throttling means acting on a lower pressure, e.g. the atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F15B13/0438—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being of the nozzle-flapper type
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
    • G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
    • G05D16/0644—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator
    • G05D16/0672—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using several spring-loaded membranes
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2093—Control of fluid pressure characterised by the use of electric means with combination of electric and non-electric auxiliary power
    • G05D16/2095—Control of fluid pressure characterised by the use of electric means with combination of electric and non-electric auxiliary power using membranes within the main valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2278—Pressure modulating relays or followers
    • Y10T137/2409—With counter-balancing pressure feedback to the modulating device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2605—Pressure responsive
    • Y10T137/2607—With pressure reducing inlet valve
    • Y10T137/261—Relief port through common sensing means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7762—Fluid pressure type

Definitions

  • This invention relates to an electropneumatic converter with solenoid valve control which by imposing a constant minimum pressure difference across each of the two control solenoid valves not only results in an evident considerable reduction in the energy required for operating said solenoid valves but also results in a substantially linear variation in converter output pressure with solenoid valve opening time, independently of feed pressure variations and the value of the converter output pressure, besides maintaining the dead times of said solenoid valves always constant with consequent improvement in control precision and repeatability, in particular for small solenoid valve opening times.
  • the pneumatic actuators of process valves are controlled by electropneumatic converters able to modulate their output pressure on the basis of electrical command signals.
  • electropneumatic converters Various types are already known in the state of the art.
  • a loading solenoid valve connected to the feed pressure and an unloading solenoid valve connected to atmosphere regulate the pressure within a capacitive chamber connected to them in series.
  • Said capacitive chamber pressure is then used to control a booster unit which is connected to said feed pressure, its purpose being to amplify the output flow rate from the converter to the extent necessary for controlling the connected actuators.
  • a pressure repeater consisting substantially of a separation membrane, a restriction and a nozzle-plate system is interposed between said chamber and said booster.
  • the object of the present invention is to obviate said drawbacks by providing an electropneumatic converter with solenoid valve control which has a linear characteristic, ie produces an output pressure which varies linearly with the activation time of the solenoid valves, the operation of which is not influenced either by the feed pressure or by the value of the output pressure, requires minimum activation energy and provides pressure values which are always repeatable even for small solenoid valve opening times.
  • the electropneumatic converter with solenoid valve control comprising two solenoid valves for loading and respectively unloading a capacitive chamber arranged in series with said solenoid valves and correspondingly connected by these to the feed pressure and to atmosphere, said capacitive chamber being connected in series with a pressure repeater consisting substantially of a membrane separating said capacitive chamber from the repetitive pressure chamber which is connected to the feed pressure via a restriction and to atmosphere via a nozzle-plate system, the pressure of said repetitive chamber being used to control the moving element of a booster unit modulating the output chamber pressure by means of a spring-loaded valving member connecting said output chamber pressure either to the feed pressure or to atmosphere, is characterised according to the present invention in that said loading and unloading solenoid valves are connected respectively to the feed pressure and to atmosphere each via a pressure regulator controlled by a differential pressure measurement device connected across the relative solenoid valve such as to maintain the pressure difference across said solenoid valve constant.
  • said object of maintaining the pressure difference across the solenoid valves constant is achieved not by the considerable constructional complication of adding two separate external pressure regulators and differential pressure measurement devices, but by adding two simple biasing springs and suitably modifying the pneumatic circuit of the converter.
  • control of the pressure difference across the unloading solenoid valve is achieved by the actual pressure repeater but modified by adding into its repetitive pressure chamber a spring acting on the separation membrane to create within said repetitive pressure chamber a pressure lower than that of the capacitive chamber, ie to create across the separation membrane a pressure difference, maintained constant by the nozzle-plate restriction system, which is equal to the thrust exerted by said spring.
  • the outlet of the unloading solenoid valve is no longer connected to atmosphere but to said repetitive chamber at reduced pressure so that said constant pressure difference is established across the unloading solenoid valve.
  • control of the pressure difference across the other solenoid valve ie the loading solenoid valve
  • said modified pressure repeater together with the actual booster unit, which is however modified by the addition of a second spring acting on the moving element of the booster unit from the control chamber of said moving element and creating a constant pressure difference across said moving element, ie between the converter output pressure and the control chamber pressure which is equal to that of the repetitive chamber of the pressure repeater.
  • the inlet of the loading solenoid valve is no longer connected to the feed pressure but to the converter output pressure, so that as the pressure differences across respectively the pressure repeater and the booster unit are constant, the difference between the converter output pressure and the pressure within the capacitive chamber, which represents the pressure difference across the loading solenoid valve, will also evidently be constant.
  • said pressure regulators and said differential pressure measurement devices for said loading and unloading solenoid valves are formed respectively by the actual pressure repeater, the repetitive pressure chamber of which is connected to the outlet of said unloading solenoid valve, in which chamber a spring is made to act on the separation membrane in the sense of urging it towards the capacitive pressure chamber, and by the actual booster, the moving element of which is biased by a second spring towards the output chamber which is connected to the inlet of the loading solenoid valve.
  • said second spring is preloaded with the load necessary to obtain a pressure difference between the output chamber and the control chamber which is double that which the other spring determines between the capacitive chamber and the repetitive chamber.
  • said restriction in the pressure repeater no longer connects the repetitive chamber to the feed pressure but instead to the output pressure, ie said restriction in the pressure repeater is connected to said converter output chamber, feed to the repeater being ensured by modulating the said converter feed valving member.
  • 1 indicates the electropneumatic converter loading solenoid valve which feeds the capacitive chamber 2 with the feed pressure 3, the unloading solenoid valve 4 connecting said capacitive chamber 2 to atmosphere via the duct 5.
  • Said capacitive chamber 2 is connected in series with a pressure repeater 6 consisting substantially of a membrane 7 separating said capacitive chamber 2 from a repetitive pressure chamber 8, which is connected to the feed pressure 3 (see specifically Figure 1) by the duct 9 via a restriction 10, and to atmosphere by the duct 11 via a system comprising a nozzle 12 and plate 13.
  • the pressure p1 in the repetitive chamber 8 is hence used in the control chamber 34 connected to the repetitive chamber 8 by the duct 35, to control the moving element 14 of a booster unit 15 modulating the p2 in the output chamber 16 via the valving member 17 which is loaded by the spring 18 and connects said output chamber 16 either to feed pressure 3, when the valving member 17 is urged against the action of the spring 18 to open the feed port 20, or to atmosphere via the duct 19 when the movement of the moving element 14 opens the discharge port 21.
  • said loading solenoid valve 1 is connected to the feed pressure 3 via a pressure regulator 22 controlled by a differential pressure measurement device 23 applied across said solenoid valve 1, ie between the inlet 24 and outlet 25 of said solenoid valve 1. In this manner the pressure difference across said solenoid valve is set and always remains constant.
  • outlet 26 of the solenoid valve 4 is connected to the duct 5 discharging to atmosphere via a second pressure regulator 27 controlled by a further differential pressure measurement device 28 applied between said outlet 26 and the inlet 29 of said solenoid valve 4, so that a constant pressure difference is also set across the solenoid valve 4.
  • the function of said pressure regulators 22 and 27 and of the relative differential pressure measurement devices 23 and 28 is performed by the said pressure repeater 6 in combination with the said booster unit 15 by virtue of the fact that in said repetitive pressure chamber 8 a preloaded spring 30 is made to act on the separation membrane 7 in the sense of urging it towards the capacitive chamber 2, a second preloaded spring 31 being made to act within the control chamber 34 on the moving element 14 in the sense of urging this latter towards the converter output chamber 16, said output chamber 16 being connected, via the duct 32 provided with filters 33, to the inlet 24 of the loading solenoid valve 1, said repetitive pressure chamber 8 being connected to said outlet 26 of the loading solenoid valve 4.
  • the spring 31 is preloaded with a load such as to obtain a pressure difference p2-p1 between the output chamber 16 and the control chamber 34 or repetitive chamber 8 which is double that (p3-p1) which the other spring 30 determines between the capacitive chamber 2 and the repetitive chamber 8 or control chamber 34.
  • a load such as to obtain a pressure difference p2-p1 between the output chamber 16 and the control chamber 34 or repetitive chamber 8 which is double that (p3-p1) which the other spring 30 determines between the capacitive chamber 2 and the repetitive chamber 8 or control chamber 34.
  • said restriction 10 in the pressure repeater 6 is fed not by the feed pressure 3 but instead by the output pressure p2 via said duct 32.
  • p2-p1 which is always constant so that the volumetric flow rate through said restriction will be substantially constant, which by drastically reducing the movements of the system comprising the plate 13 and nozzle 12 provides a considerable increase in the precision of the repeater.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Control Of Fluid Pressure (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
EP94201712A 1993-06-22 1994-06-15 Electropneumatic converter with solenoid valve control Expired - Lifetime EP0632203B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9430011T SI0632203T1 (en) 1993-06-22 1994-06-15 Electropneumatic converter with solenoid valve control

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI931335 1993-06-22
IT93MI001335A IT1264866B1 (it) 1993-06-22 1993-06-22 Convertitore elettropneumatico perfezionato con comando ad elettrovalvole

Publications (2)

Publication Number Publication Date
EP0632203A1 EP0632203A1 (en) 1995-01-04
EP0632203B1 true EP0632203B1 (en) 1996-05-22

Family

ID=11366444

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94201712A Expired - Lifetime EP0632203B1 (en) 1993-06-22 1994-06-15 Electropneumatic converter with solenoid valve control

Country Status (11)

Country Link
US (1) US5586575A (es)
EP (1) EP0632203B1 (es)
JP (1) JPH0719202A (es)
AT (1) ATE138452T1 (es)
CA (1) CA2126403A1 (es)
DE (1) DE69400199T2 (es)
DK (1) DK0632203T3 (es)
ES (1) ES2087792T3 (es)
GR (1) GR3020186T3 (es)
IT (1) IT1264866B1 (es)
SI (1) SI0632203T1 (es)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19531020C2 (de) * 1995-08-22 1998-11-26 Samson Ag Elektrisch-pneumatischer Umformer
US6006780A (en) * 1997-06-23 1999-12-28 Alliedsignal Inc. Two-stage, warm-gas high pressure regulator
DE19818336C1 (de) * 1998-04-23 2000-01-13 Samson Ag Elektrisch-pneumatischer Umformer sowie diesen umfassender Regler
JP3634733B2 (ja) * 2000-09-22 2005-03-30 Ｓｍｃ株式会社 流体圧力調整装置
US20050109395A1 (en) * 2003-11-25 2005-05-26 Seberger Steven G. Shut down apparatus and method for use with electro-pneumatic controllers
WO2008011092A2 (en) * 2006-07-20 2008-01-24 Askew Andy R High pressure transducer
CN100445916C (zh) * 2006-12-30 2008-12-24 浙江大学 定压差跟随压力气动控制阀
DE102007058518A1 (de) * 2007-12-05 2009-06-18 Abb Ag Verfahren zum Betrieb eines Stellungsreglers
US9145904B2 (en) 2011-10-17 2015-09-29 Emerson Process Management Regulator Technologies, Inc. Pilot operated fluid regulators having a reset apparatus and related methods
CN105593536B (zh) * 2013-07-18 2017-07-07 Abb 技术有限公司 具有故障冻结模式的分立式先导级阀装置
CN106461096A (zh) * 2014-01-07 2017-02-22 桑杜科技有限公司 流量控制阀
US9969315B2 (en) * 2014-06-30 2018-05-15 Signode Industrial Group Llc Pneumatic inflator for automatically inflating inflatable articles to a desired pressure
US9695988B2 (en) * 2015-11-11 2017-07-04 Chad Deville Pipeline-waste-gas reducer apparatus
US9689534B2 (en) * 2015-11-11 2017-06-27 Chad Deville Pipeline-waste-gas reduction method
JP3215436U (ja) * 2017-01-11 2018-03-22 台灣氣立股▲ふん▼有限公司 省エネ型精密圧力調整弁の構造
US10409298B2 (en) * 2017-04-27 2019-09-10 Marotta Controls, Inc. Electronically controlled regulator
EP3502487B1 (en) * 2017-12-22 2021-08-25 Hamilton Sundstrand Corporation Servo valve
IT201800005897A1 (it) * 2018-05-31 2019-12-01 Valvola per fluidi, preferibilmente per gas
CN111122519B (zh) * 2018-10-30 2023-07-18 重庆民泰新农业科技发展集团有限公司 原子荧光仪用闭环流量控制系统及控制方法
TWI689676B (zh) * 2019-01-10 2020-04-01 台灣氣立股份有限公司 電控大容量比例閥
TWI689678B (zh) * 2019-03-07 2020-04-01 台灣氣立股份有限公司 真空電控比例閥
TWI689679B (zh) * 2019-03-08 2020-04-01 台灣氣立股份有限公司 真空大容量電控比例閥
IL268254A (en) * 2019-07-24 2021-01-31 Ham Let Israel Canada Ltd Flow control accessory
DE102020206030B3 (de) * 2020-05-13 2021-07-22 Festo Se & Co. Kg Ventilvorrichtung, System und Verfahren

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DE3216693A1 (de) * 1982-05-05 1983-11-10 Kienzle Apparate Gmbh, 7730 Villingen-Schwenningen Elektropneumatisches servoventil zur steuerung eines volumenstromes bzw. eines druckes
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Also Published As

Publication number Publication date
ITMI931335A0 (it) 1993-06-22
DE69400199D1 (de) 1996-06-27
ATE138452T1 (de) 1996-06-15
ITMI931335A1 (it) 1994-12-22
DK0632203T3 (da) 1996-08-05
CA2126403A1 (en) 1994-12-23
EP0632203A1 (en) 1995-01-04
GR3020186T3 (en) 1996-09-30
SI0632203T1 (en) 1997-10-31
IT1264866B1 (it) 1996-10-17
DE69400199T2 (de) 1996-10-31
US5586575A (en) 1996-12-24
JPH0719202A (ja) 1995-01-20
ES2087792T3 (es) 1996-07-16

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